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tint/reader/wgsl/lexer: Make '>>=' splittable

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Could be split when matching template argument lists.

Bug: tint:1810
Change-Id: I34421d2a27a8b2294fa0201793e7340c0f172df7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/117209
Commit-Queue: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
This commit is contained in:
Ben Clayton 2023-01-23 18:32:41 +00:00 committed by Dawn LUCI CQ
parent 5f3449f000
commit 6fc130bfcc
3 changed files with 30 additions and 14 deletions
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7
src/tint/reader/wgsl/lexer.cc
View File

@ -96,9 +96,10 @@ std::vector<Token> Lexer::Lex() {
while (true) {
tokens.emplace_back(next());
// If the token can be split, we insert a placeholder element into
// the stream to hold the split character.
if (tokens.back().IsSplittable()) {
// If the token can be split, we insert a placeholder element(s) into the stream to hold the
// split character.
size_t num_placeholders = tokens.back().NumPlaceholders();
for (size_t i = 0; i < num_placeholders; i++) {
auto src = tokens.back().source();
src.range.begin.column++;
tokens.emplace_back(Token(Token::Type::kPlaceholder, src));

19
src/tint/reader/wgsl/lexer_test.cc
View File

@ -989,7 +989,6 @@ INSTANTIATE_TEST_SUITE_P(LexerTest,
TokenData{"&=", Token::Type::kAndEqual},
TokenData{"|=", Token::Type::kOrEqual},
TokenData{"^=", Token::Type::kXorEqual},
TokenData{">>=", Token::Type::kShiftRightEqual},
TokenData{"<<=", Token::Type::kShiftLeftEqual}));
using SplittablePunctuationTest = testing::TestWithParam<TokenData>;
@ -1010,18 +1009,23 @@ TEST_P(SplittablePunctuationTest, Parses) {
EXPECT_EQ(t.source().range.end.column, 1u + strlen(params.input));
}
{
auto& t = list[1];
const size_t num_placeholders = list[0].NumPlaceholders();
EXPECT_GT(num_placeholders, 0u);
ASSERT_EQ(list.size(), 2u + num_placeholders);
for (size_t i = 0; i < num_placeholders; i++) {
auto& t = list[1 + i];
EXPECT_TRUE(t.Is(Token::Type::kPlaceholder));
EXPECT_EQ(t.source().range.begin.line, 1u);
EXPECT_EQ(t.source().range.begin.column, 2u);
EXPECT_EQ(t.source().range.begin.column, 2u + i);
EXPECT_EQ(t.source().range.end.line, 1u);
EXPECT_EQ(t.source().range.end.column, 1u + strlen(params.input));
}
{
auto& t = list[2];
EXPECT_EQ(t.source().range.begin.column, 1 + std::string(params.input).size());
auto& t = list.back();
EXPECT_TRUE(t.Is(Token::Type::kEOF));
EXPECT_EQ(t.source().range.begin.column, 2u + num_placeholders);
}
}
INSTANTIATE_TEST_SUITE_P(LexerTest,
@ -1029,7 +1033,8 @@ INSTANTIATE_TEST_SUITE_P(LexerTest,
testing::Values(TokenData{"&&", Token::Type::kAndAnd},
TokenData{">=", Token::Type::kGreaterThanEqual},
TokenData{"--", Token::Type::kMinusMinus},
TokenData{">>", Token::Type::kShiftRight}));
TokenData{">>", Token::Type::kShiftRight},
TokenData{">>=", Token::Type::kShiftRightEqual}));
using KeywordTest = testing::TestWithParam<TokenData>;
TEST_P(KeywordTest, Parses) {

18
src/tint/reader/wgsl/token.h
View File

@ -379,10 +379,20 @@ class Token {
return type_ == Type::kVec2 || type_ == Type::kVec3 || type_ == Type::kVec4;
}
/// @returns true if the token can be split during parse into component tokens
bool IsSplittable() const {
return Is(Type::kShiftRight) || Is(Type::kGreaterThanEqual) || Is(Type::kAndAnd) ||
Is(Type::kMinusMinus);
/// @returns the number of placeholder tokens required to follow the token, in order to provide
/// space for token splitting.
size_t NumPlaceholders() const {
switch (type_) {
case Type::kShiftRightEqual:
return 2;
case Type::kShiftRight:
case Type::kGreaterThanEqual:
case Type::kAndAnd:
case Type::kMinusMinus:
return 1;
default:
return 0;
}
}
/// @returns true if the token is a binary operator